Improvement in paper-bag machines



2 Sheets-Sheet 1.

W. O. GROSS. Paper-Bag Machine. No. 222,464. Patented Dec. 9, I879.

E IEO 0U! H] 1 L I I I I 6 6 1' Q I 6 9 l 2 Sheets-Sheet 2.

W. C. GROSS; Paper-Bag Machine. No. 222,464. Patented Dec. 9, I879.

lar blank I enters.

acts as a guide.

vention. Fig. 2 is a planet" the same.

."Uivi rnn STATE-s PATENT OFFICE.

w1nLIAM o .cBoSS,oF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN PAPER-BAG MACHINES.

Specification forming part of Letters Patent hlo. 22 2,4641, dated December 9, 1879; application filed November 1, 1879.

To all whom it may 0mm.-

Be it known thatI, WILLIAM G. GROSS, of

Boston, 'Massachusetts,'have invented certain new and useful Improvements in Machinery for Making Satchel-Bottom Paper Bags, of which the following is aspecification.

My invention relates particularly to that portion of thesatchel-b'ottom-bag-making machinery by which the first or diamond fold is formed.

I combine with feed mechanism and a guide a reciprocating and vibrating carrier of holder, between which and said clamp, or its equivalent, one of the plies of the advancing tubu The said carrier has a forward movement in unison with the forward feed movement of the blank so long as the latter is engaged by the clamp or its equivalent. It also has simultaneously'a vibratory movement on an axis, by which it causes'the clamp which it carries to turn down and fold back flat the clampedor engaged ply of the blank, the line of fold being accurately determined by the rear edge of the carrier, which It is in this combination of parts that my invention principally resides.

To enable others skilled in the art to understand and use my said invention, 1 shall proceed to explain the manner in which the same is or may be carried into effect, b y.referenee to the accompanying drawings, in which Figure l is a side elevationof so much of a machine as neededinorder to illustrate niy inlgS. 3 and 4 are longitudinal vertical central sections of the same, representing the folding mechanism in two different positions. Fig. 5 is a bottom view of the machine with the lower delivery-rollremoved in order that the position of the blank at the time the diamond foldis completed may be more clearly seen. Fig. 6 is a view on an enlarged scale of the camarm and parts immediately adjacent thereto, by

which the carrier or holder is vibrated. Fig. 7 is a perspective view of the blank and carrier and clampor jaw, representing the parts in the position which they occupy when the forward end of one of the plies of the blank is entering between the clamp and the holder. Fig. 8 represents detached sectional views, on an enlarged scale, of the guide-bar and the clamp ing-jaw. Fig. 9 is a View of a modified form of clamp or holding jaw or finger.

The working parts of the machine are supported in suitable frame-work, as shown.

The stationary trunk or former A is of ordinary or suitable construction. Around it passes the tubular blank, which is made or formed up from a paper strip fed. from a roll of paper, in the usual way. with its lapped edges pasted together. I have not deemed it necessary to show the tube forming and pasting mechanisms, inasmuch as they are well known and form no part of my invention.

In front of the trunk or former is a central horizontal guide rod or bar, 13, which is fixed to, and forms a prolongation of, the trunk,

said bar preferably extending forward as far as the delivery-rolls B.

In' front of the trunk are feed-rolls G, be tween which the guide-bar passes.

Between the feed and delivery rolls is the reciprocating and vibrating holder or carrier 0, which is a plate or frame of suitable form, provided with a straight transverse rear edge, and provided at its ends with journals to, which move in horizontal slots or guideways bin the frame of the machine. It is caused to move back and forth in said slots by suitable means, consisting in this instance of forked arms 0, which are fast to, and extend from, a rockshaft, 0?, and at their upper ends straddle the journals of the carrier-plate.

The rock-shaft is caused to move at proper times and to the proper extent by a rotating cam, e, fixed on a shaft, f, and acting with its periphery on a stud or roller projecting from the connecting-rod g, which is jointed, as shown, to one of the radial arms 0.

A sprin g, h, tends to hold the connecting-rod g in contact with the cam.

Simultaneously with its reciprocating movement the carrier is caused to vibrate by means of a cam slotted arm, 12, attached to one of its ends or journals, and engaging a pin or stud, j, fixed to the machine-frame, as shown in Fig. 6. The arrangement of parts is such that when the carriermoves forward it will swing down and back, and when it recedes it will swing up into its first position.

011 the upper face of the carrier or holder, at or near its front end, and at a point immediately beneath the central guide bar or rod, is a uipper or clamping-jaw, k.

It is intended that the front end of the under ply of the blank, which moves forward on the guide-rod, shall enter between this clamping finger orjaw or nipper and the carrier or holder. To insure this I form in the under side of the guide-bar a longitudinal recess, Z, into which the free end of the jaw enters when the carrier Is in position to take hold of the blank, thus permitting this end of the jaw to rise above the under face of the guide-bar.

The clampingjaw shown in Figs. 3, 4, 7, S is the one which I on the whole prefer. It is in reality a vibratory three-armed lever pivoted at m to the carrier, so that the clamp may move to and from the adjoining face of the carrier. The one arm I: is the clamp proper. The other two arms, it it, are stops or projections, one of which, when the carrier has swung to either one of its extreme positions, abuts against the guide-bar, and so serves to lift the clamp away from the carrier, against which said jaw is at other times held by a spring, a.

Above the guidebar is a smoothing strip or tongue, F, fixed to the machine-frame, between which tongue and the guide-bar the upper ply of the tubular blank passes. This device is provided in order to prevent the upper ply.

from possibly wrinkling, or puckcring at that point while the diamond fold is being made.

In front of the carrier or holder plate are inclined guideplates I), which serve to direct the diamond-folded front end of the blank into the delivery-rolls, and to prevent said end from wrinkling or crumplin g.

The operation of the parts is as follows, supposing the blank to be properly entered between the feed-rolls, the feedrolls and delivery-rolls moving at the same surface speed, and all the parts being properly geared to the driving or first-motion shaft E, as indicated in Fig. 1: When the machine starts the tubular blank 19, Figs. 5 and 7, passes forward from the trunk or former between the feed-rolls and around the central guide-bar until the front end of its under ply enters between the clamping-jaw and the carrier or holder, as indicated in Fig. 7, the clamp I: being, for this purpose, held open by the arm k, as indicated in Fig. 3. The devices for giving horizontal reciprocatory movement to the carrier are so timed that the carrier begins to move forward when the under ply has entered the proper distance between the clamp and the carrier. As soon as the carrier moves forward it at the same time begins to swing downward by reason of the slotted cam-arm i and the stud j. This movement removes the projection or arm k from contact with the guide-bar, and so permits the spring a to close the clamp upon the under ply, which is thus securely held. The carrier moves bodily forward in unison with the blank. At the same time it swings down and back, so that by the time the extreme forward point of reciprocation has been reached it has swung back to the extent of about a half'circle, as shown in Fig. 4, carrying back with it the under ply held by the clamp, as indicated in Fig. 5, the said ply being folded back across the rear edge of the carrier, which serves to determine the line of fold, while the upper ply, forming the front end of the diamond fold, is upheld and guided to and between the delivery-rolls by the guide rod or bar. When the carrier arrives at the position represented in Fig. 4 the stop or projecting arm k, which is new uppermost, presses against the guide-bar with the effect of tilting the clamp proper away from the carrier, thus releasing the under ply now forming the rear flap ot' the diamond fold. The blank freed from the clamp is carried forward, diamond fold down, by the deliveryrolls, between which it passes, and from which it is discharged, the inclined guide-plates D keeping the diamond fold smooth and causing it to pass without puckers or wrinkles to the delivery-rolls. As soon as the rear flap of the diamond fold has passed forward the proper distance out from between the clamp and. the carrier the latter retires and resumes its first position, (indicated in Fig. 3,) in readiness to again act.

In case of using a blank having the form of a continuous tube fed continuously forward,

which I prefer and shall in practice use, I I i can employ any suitable device for severing from the tube a blank of the length required for the bag. The cutters for this purpose may be arranged in the feed-rolls, a small supplemental cutter being used to sever the central portion of the blank, opposite the guide-bar, in case that portion could not conveniently be severed by the main cutters; or I can employ cutting devices independent of the feed-rolls, as will be understood without further explanation.

I have not here shown means for completing the satchel-bottom by folding over the end flaps of the diamond. Any suitable mechanism can be used for the purpose, to which mechanism the diamond-folded blank can be conveyed by suitable instrumentalities from the delivery-rolls; or said delivery-rolls may form a portion of the said completing mechanism-such a mechanism, for instance, as 1 have shown and described in my application for Letters Patent filed in the United States Patent Office on or about September 29,1879,

.9, the said jaw being a simple strip of metal cases, so as to use the same quantity of paper,

whether making larger or smaller bags. The

, smaller the bags the more of them would be made during the same period of time and with the same quantity of paper. All that would be needed would be to change the speed of the movement of the carrier, andto timeit properly in its movement. It might also be desirable to bring the delivery-rolls nearer the feedrolls for smaller bags, and they could'be made adjustable for the purpose. These changes may readily be made by properly changing the gears which transmit movement.

It is manifest that the combined reciprocating and vibrating movement of the carrier can be obtained in other ways, and by means of mechanical devices other than those shown in illustration of my invention.

Having described my inven tion, whatI claim, and desire to secure by Letters Patent, is

1. The combination, with feed mechanism and the guide bar or rod, of a reciprocating and vibrating carrier or holder, means for actuating the same to move substantially as described, and a clamp or retaining jaw on said carrier, between which and the carrier passes and is retainedthat ply of the blank which is to be folded back to make the diamond fold, the combination being and acting substantially as hereinbefore set forth.

2. The reciprocating and vibrating carrier, and means for actuating the same to move substantially as described, in combination with the clamp or retaining jaw mounted on said carrier, and the guide bar or rod provided with a recess, in which the free end of the clamp is received, substantially as and for the purposes set forth.

3. The combination, substantially as hereinbefore set forth, of the reciprocating and vibratin g carrier or holder, the clamping or retaining-jaw on the same, the guide bar or rod, the feed mechanism, and the delivery-rolls.

4. In combination with the reciprocatory and vibratory carrier and the guide rod or bar, the spring-closed clamping or retaining jaw hinged or pivoted to said carrier, and the stops or projecting arms which operate to open said jaw at either extreme of the vibratory movement of the carrier, substantially as set forth.

5. In machinery for making the first or diamond fold of a satchel-bottom paper bag, areciprocating and vibrating carrier-plate external to the blank, provided at its front with a nipper or jaw to grasp that ply of the blank next to it, and at its rear with a transverse guide or folding edge, over which said ply is folded by the vibratory movement of said plate, while the latter and the blank move forward together, substantially as hereinbefore set forth.

In testimony whereof I have hereunto set my hand this 31st day of October, A. D. 1879.

W1LmAM o. onoss. 

